After some digging, it’s not actually the module that is missing – it was one of the module’s dependency which is the mysql client library.

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[root@pxc03 keepalived]# yum deplist perl-DBD-MySQL.x86_64|grep mysql

dependency:libmysqlclient.so.16()(64bit)

provider:mysql-libs.x86_645.1.71-1.el6

dependency:libmysqlclient.so.16(libmysqlclient_16)(64bit)

provider:mysql-libs.x86_645.1.71-1.el6

I recently botched the shared-compat package on this instance while rotating packages with “–nodeps” hence, missing it silently :-D. After reinstalling, everything was again fine. I hope nobody else have to lose hair on this one.